TABLE 1.

Zeta potentials for various bacteria and crushed quartz glass as calculated from measured electrophoretic mobilities

Particle or bacterium	Zeta potential (mV)a
Smooth-swimming E. coli in high-ionic-strength (I = 0.2 M) solution	−19.6
Smooth-swimming E. coli in low-ionic strength (I = 0.006 M) solution	−25.1
Hollow polystyrene microspheres	−20.1
Quartz in high-ionic-strength (I = 0.2 M) solution	−18.7
Quartz in low-ionic strength (I = 0.006 M) solution	−56.8
Positively coated quartzb	1.0
Hydrophobic quartzb	−0.5

^aValues have an error of ±2.5 mV.

^bEstimated zeta pontentials.